Fill in the blank: Heterogeneous mixtures allow you to see and separate their components, such as ___ and ___.

Trail mix and vegetable soup

True or False: Compounds can be separated into their constituent elements by physical means.

False. Compounds can only be separated into their elements through chemical reactions.

What is the significance of the ratio of components in a compound?

The ratio of components in a compound is fixed and defines its unique properties, differentiating it from mixtures where the proportions can vary.

Riddle: I’m a mixture of gases that you cannot see, yet I’m essential for you to breathe. What am I?

Air

List the two main types of pure substances and provide examples for each.

Elements (e.g., gold, oxygen) and Compounds (e.g., water, sodium chloride).

Fill in the blank: A homogeneous mixture is one where the components are so well mixed that they cannot be seen separately, such as ___ dissolved in water.

Sugar

What role do alloys play in everyday materials, and can you give two examples?

Alloys enhance strength and durability.

• Bronze is a copper-tin alloy.

• Stainless steel resists corrosion.

• Alloys improve material performance.

True or False: Dust particles in the air are considered pure substances.

False. Dust particles are components of a mixture and can vary in composition and concentration.

What are native minerals, and provide two examples?

Native minerals are pure elements that occur naturally in their elemental form; examples include gold and sulfur.

Riddle: I’m a compound essential for life, made from two elements, H₂ and O. What am I?

Water

How do the properties of a mixture depend on its components?

The properties of a mixture vary based on the types and proportions of its components, as each retains its original characteristics.

What is the Air Quality Index (AQI) used for?

The AQI measures air quality by indicating the levels of major air pollutants, helping to assess health risks associated with air quality.